Tool-holder.



S. G. GRADY. TOOL HOLDER.

APPLICATION FILED MAY 8. I914.-

Patented July 13, 1915.

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STEPHEN Gr. GRADY, 0F BOSTON, MASSACHUSETT$, ASSIGNOR TO LORENZ MUTHER,0F i I NEWTON, MASSACHUSETTS.

TOOL-HOLDER.

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Specification of Letters Patent.

Patented July 13, 11915.

Application filed May 8, 1914 Serial No. 837,301.

To all whom it may concern: I

Be it known that I, STEPHEN G. GRADY, a citizen of the United States,residing in Roxbury district, city of Boston, county of Suffolk, Stateof Massachusetts, have invented certain new and useful Improvements inTool-Holders, of which the following is a specification, reference beinghad to the drawings accompanying the same and forming a part thereof.

My invention relates to a tool holder for holding drills, reamers, taps,boring tools and the like, while they are used in :lathe drills, boringmachines, and other similar machines.

The objects of my invention are to provide a tool holder in whichvarious sizes of tools, such as drills, reamers, taps, boring tools andsimilar articles may be secured in the holder against rotative and axialmovement with relation to the holder.

A further object of my device is to provide a holding and centeringdevice so made and arranged that it can be used with tools havingeithera male or female center or without any center.

In the drawings accompanying this specification and forming a partthereof Figure 1 shows the device with a section of the end of the drillor reamer having a male center secured in the holder, with the holdershown as secured in the tail-stock of a'lathe or boring machine. Thisview is what might be termed a side elevation; Fig. 2 is a plan view ofthe tool-holder with the end of a tool inserted therein; Fig. 3 is asectional end view taken through line 33-Fig. 1; Fig. 4; is a side viewof that portion of a tool-holderwhich is secured to the machine withwhich the same is to be used, with the other parts of the holderremoved.

1n the embodiment of my invention, 1 represents a section of the end ofthe tail-stock of the machine with which my holder may be used; 2 is atapering center formed upon the holder, which is shaped to fit in a holein the tail-stock of the machine. This center 2 has a hole 3 in it,designed'to receive a double-end removable center 1 provided with a malecenter 5 at one end and the female center 6 at the other, and arrangedto receive a tool having either a male or female center, as the case maybe.

In the illustration shown in Fig. 1, 7 is the shank of a tool,either areamer or drill, and which is provided with a male center 8 for thepurpose of illustrating the use of my tool-holder. There is secured tothe center 2 of the tool-holder the portion 9 having Wings 10 and 11extending laterally outward from it, which wings 10 and 11 are providedwith the grooves l2'and 13 adapted to receive the ends 14 and 15 of thepart 16 in which the tool is secured, thet'ool being secured in the hole17, which hole is so shaped that tools having. shanks of different sizesmay be secured therein in such manner that their centers will beautomati cally centered to the axis of rotation of the tool-holder,irrespective of the size of the tool. The meeting faces of the bottom ofthe grooves 12 and 13 and the faces 19 and 20 of the portion 16 in whichthe tool is secured, are so positioned that the holder 16 may be put inwith its ends 1% and 15, either in the position shown in Fig. 3, or itmay be reversed and still have the center of the tool held in the holder16 come in exact alinement with the center in the double-endcenter-piece a.

Another of the purposes of my improved tool holder is, when a tool issecured in the holder 16 by means of the binding-screw 21, and the part16 dropped with its ends 1 1 and 15 within the grooves 12 and 13, toprevent the tool 7 from being moved or pulled endwise in eitherdirection, as 1 provide means whereby it is firmly held by the sides ofthe portions 1 1 and 15 contacting with the sides of the grooves 12 and13. This prevents what we term the hogging or catching of the tool.Further, when used in a lathe the part 9 and its center 2 may be firmlysecured in the tail-stock 1 against rotation or endwise movement, andthereby prevent rotation of the tool 7 when the binding screw 21 issecurely pressed against the shank 7 and the holder 16 is placed in thegrooves 12 and 13 in the holder 9, as illustrated in Figs. 1, 2 and 3.

I do not wish to confine myself to the eX- act form of the parts asshown herein or to its use with any particular machine-tool, or anyparticular type of small tool, such as drills, reamers, etc. except asnecessitated by the appended claims, as its shape may be surfacesadapted to detachably engage and slide in said guiding'grooves so as toprevent axial movement of said second member, as Well as rotativemovement in one direction, but permitting slight rotative movement inthe other direction Which will permit the disengagement of said member;and means for detachably securing an article in said second member so asto bring its axis in line With the axis of said holder. 7

2. A holder adapted to be used with mai chine tools, comprising a memberarranged to be secured to a machine tool and provided With oppositelydisposed members having guidinggrooves, formed therein; a second memberhaving oppositely disposed guiding surfaces adaptedto detachably engageand slide in said guiding grooves so as to prevent axial movement ofsaid second member, as vWell as rotative movement in one direction, butpermitting slight rotative movement in the other direction Which willpermit the disengagement of said members; means for detachably securingan article in said second member so as to bring its axisin line With theaxis of said holder; and a centering device for centering and holding anarticle against lateral movement.

In testimony whereof, I have hereunto set my hand, in the presence oftWo subscribing Witnesses, this the 7th day'of May, A. D.

STEPHEN G. GRADY. lVitnesse's I P. W. PEZZETTI, R; P. ELLIOTT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

